Final answer:
To combine like terms -7y³-3y+5y-y³-4+7y³-7y, we can add or subtract the coefficients of the terms with the same variable(s) and exponent(s).
Step-by-step explanation:
To combine like terms in the expression -7y³-3y+5y-y³-4+7y³-7y, we can add or subtract the coefficients of the terms with the same variable(s) and exponent(s).
Combining the terms: -7y³ - y³ + 7y³ = -y³, -3y + 5y - 7y = -5y, and -4 - 7y = -7y - 4.
Putting it all together: -y³ - 5y - 7y - 4.